Renewable fuse.



F. N. CONANT.

RENEWABLE FUSE.

AIIPLIQATIQN FILED III/III. 9. Ism.

` lPatented Apr. 1,1919.

i To all whom it ma UNTTED STATES PATENT canton,

IBANKLIN N. CONANT, F NEWBURYPORT. MASSACHUSETTS, SSIGNQB, T@ CHASESHAWHUT COMPANY, 0F NEWBUBYPORT, MASSACHUSETTS, A COBPMT Ella RENEWABLEFUSE.

concern: Be' it lmown vt at I, FRANKLIN N. Co-

I 4NANT a citizen of the `United States, and

a lresldentj'zo'f'Newburyport, Vcounty of Essex, and State-.ofMassachusetts, have -in'- vented anIin -iiiffe of which-the ll'owing isa s" eciiication.

My invention relates to inc osed fuses of the cart-ridge type,havingknife-blade contact blades and'particularly has, as an object, toprovide a structure of such strength that'repeated renewals can be madewlth 'a minimum of deterioration, and so sim le Vand easy to, assemblethat any. unskil ed user can renew; the fusible elementeasily,l

accurately gandwithout tools.

My inventionhas other advantages which will be apparent to those skilledin the art, from the mere examination of the drawin in connection withthe specification not t e least of which advantages is the act that nal3 vlocks 'the terminal platea 5' a person skilled inthe manufactureofsuch articles can make the structure at a remarkably low cost,considering the massive charl acter of all portions bearing 'a strain:

' In the drawings, Figure 1 show'sln side elevation vand partialrsectiona fuse made.

in accordance with my invention.

Fi 2 is an end view of the fer-rule showin t e inwardly "extendingliange. @i 3 is a plan\view of one of the termiates. 4 is a lan view ofthe plate which inst rotation. Fig. 5 isa plan view o 4a washer. Fig. 6is a. lan view of the late formn the slotted) end portion of t e endcap. ig. 7 is a erspectiveview of the end. ca with the s otted end plateremoved. v Illig. 8 is a perspective v1ew of @edificaton of the tubularportion, having the inwardly extending flange.

Fig. 9 is a plan view of embodying my invention.

'In this specification, the word v fuse 1s a vfusible element used toinclude not only the fusible element,

'l represents' the tubular fibercasing and 2 a metal tube or ferrulepermanently fastened thereto by screws 3.01' other suitable fastenings,said tube-being exteriorly screw Specification of Letters Patent.

ment in Renewable Fuses,

mg ange 4, which engages and holds the knife-blade Contact plates 5 aainst movement, both longitudinal an rotational, when the en'd ca is inplace, as hereinafter pointed out. his inwardlyv extending iiange (seeF1g.2) has a central opening wluc-h 1s WideA enough one way to receivethev full width of the terminal contact blade 5, while at anotherportion the opening lsjtoo small to receive the entire width of theterminal blade 'against longitudinal movement, as hereinafter described.By preference I make the opening in the inwardlyV extending ilange '4circular vexcept for diametric notches 7 at one portion. The notchedportion 7 should rovideI an o ening to receive the entire width of the bade 5, wh-ile the opening elsewhere is narrower than lthe main body ofthe blade 5, but slightly wider than the blade at the notched portionoffsaid blade. The terminal blade 5 is provided with notches 8 in itsedge, preferably two opnositely placed notche and it will readily beseen that the termina blade ma?I be slipped throu h the notches 7 in theange 1 of the ferrule 2, and when flan e wil enter the notches 7 and thekni e-blades 5 will be held very firmly against longitudinal movement bythe abut@ ments 6.

In order to lock the knife-blade plates in this vposition againstrotation, I provide a late 9, having aslot 10, which iits thelmifelade 5and 1s provided with a prot-uberance or'protuberances 11 which enter thenotches 7 of the inwardly extending ange, as shown in Fig. 1, and areheld firmly against rotation by the walls thereof. Means for preventingventing) of the metal vapor formed when the fuse lows, of any desiredcharacter, may then if desired be placed 4Patented Apr. i, il.Application led March 9, 1918. Serial No. 221,344. l

uarter circle'the walls 6 of the around the knife-blade, for instance, aslotted l leatherwasher 1'2. An end cap 13, screw threaded, andpreferably having a separate slotted plate 1l which forms thejendportion is then screwed over the tube 2, thus in any desired manner andmay consist of any proper material or of any desired con-= threaded andhaving an inwardly extend- '-guration, In the drawings 1 hwgshown ymende-m, in which, in place el? e fernee e ubule'f meel' pueden i8,perefmeeeol 'fee the lmfe'fier ef the tending bevond 'elle seme riseexeasen l@ beleg es bed The of 'elli v melee-5 pmezieeble and *elmfeeelelf ehe total "ee fi, 'wmlneulz A, efe eomseinmg levemiem been L? @e end@epe 'lll eee me- .Seewed end elle eeemeels turned e quarter eem, se es'te eeeupy elle meedeed peten ef l ages 39 when 'elle f'eemlnels een lee"e 'fuse cese sleetlld be ao remove-e9 se pee- .,e by previene se newfusible element bebe/*eee :lle emlmls in ienne?? es byvuneeewing ehelube mgmens the elle terminal? end esble element., This 'eomblneelsteueeure, fmfieely7 the two esllele elemem; luetween lueugh liken'oches Hnge uml elle seminal blade eeg i ef the llenge l., efe e,@mariee "Quel placed over (me -s les pfefsulemnees stef Wil the :notchesreeling The the plee M are elle@ eten wel the enel eem-Weel n Le elf eneeee-awe eesembled in like mennen The intende? 45 the fusible case meg,if desire, loe llel Willi the usual 'fuse @lling materiel, such asgfound sulfate of eeleium9 sleked lime, er other suiieble materiel,either im Whole 01 in in elle manner.

ne fusible elemenl, l@ is formeel of e strip ezhez" easily fusiblemeez'iel and e plueltjf ef lenqitednel Filets 20 Miele divide lilleuelele element inte of easily illisible pee-biens 2L Q0 we Ee '.i'velysaggerec'l enel @all easily fusible pommes we 'thereby "e'wne Wgl moreeasily :fusible @melone Q2 eli eieggesteel in respect lie each otherenevebj/ eel'ie'elze. he fue-ing 'periene when we blows,

le eeft een cemled in sei@ easing Sleee and elle @ber enel is thenelelm:VS l. lin en ele-Cirie fuse, melee." having e faermimel wellen? e perienhaving en mwmfdly er willi a. recess lleee? e ersmmel l men with saidlauge fee ifea lemgudnel 'meemen im eel@ e end plaie engegealele *QN lpluie having ze pejeelem wiel?. the l'eeess in seid Hnge, te pee-vent"me- 'ienel movemeue ef smicl fermeel plete? and im end cap detaclmblyeemleeeeel wll eanel terminal pertiee le leek said ibelmimel blade inpeson.

2 le en eleeh'e fuse, e eyllmleleel fiber cese having; exlerolly'-eleaeleel .metaal if rules ai each. eed thereof, effelee' leinginmiu'clly exeenelmg flanges with elimme 'iemoehes lerein mclapieclle receive e lee mm lelacle7 e terminal blade .having epee site moelleein 'elle edge lille/reele edepeeel te he inwardly exlaeneling wells @nlSeid zmge and be held theeby against longiludll nal movement, eleelengg-plate adepte@ te engage saicl emeluel lvl emi eefll enel pevemrotational esf'emeee minal Mada', enel el eey@ eerewallreedeel meel@emplee-'l leek ed plete enel faeemmel leleele le eleefge lese, shell eeease eem prisng e tubular lJ-ely piel and metal 'mees ite 'fu-lee @nelthereof, seid Knevel cubes labeling exeeee screw-'tlmeedecl enel veeelve'eeieely serew-'lmeedel @nel eme fzleeeen9 e .W5 @enge emenelimgf; leeel. mbe. having em. epem r l l the locking-plete im posit-leze?sulbe'eeaelly 35.6 as desezibefl.. v

:flamed te feeeive imererly sereW-"fh'eeeil enel mp9; themen? a Hngeezienclng iuwauf'flly 'enl each mete-l tube hevng am opening 'bereinademe@ .le 'eeeve e *Lerm* nel blade at one pereee e Mfiel @peeing emeat another portion being provided with an v.

abutment adapted to fit notches in the terminal blade and bold saidterminalv .blade aga-inst movement lonn'itudinal of the oase; e terminalblade having notchesl there,- in adapted to engage said abutment, ametal locking plate havin a. slot therein adapted to fit said terminalbl flanges and 'engage vthe Walls of said anges so as to preventrotation of said plate and the terminal blade, end an end cap adapted tobe screwed upon said metal portion and hold the locking-plate inpositionLsubstanf tially as described.

5. A renewable fusible element for elec- .tr fuses consisting of a stripof readily :element betvveenfit ade and protuberances adapted to enter aWide portion of said .TQ A yrenew able lfusible .element foreleoti'ioffuses "consisting, of -afstrip or fusible nietel'rhavingaplurality of readily fusible portions'arranged inv staggered relation,seid readilyffusibleportions being longer then Q the combined integrallportions of the fusible sjterminals. f

lfi8r. An] inelosedl electrie fuse j 'of the oar-"tridgeiftypejfcoinpri'sing;aninclosing casing #of liber "having,.terminal Contact portions v'and a fusible 'ele'.r'n'ent therefore'comprising a .strip'offusible vmateriel having ya plurali'tyfovlon'gi'tudinal slots therein forming a plurality'oireedilyfusible portions lieving theirmost fusible portions in staggeredrelation, to seid terminal contact l1 'i portions.

.In testimonyW-hereof l lieve sime I' name to thisv specification in twosubscrlbing Witnesses,

FRANKLlN lill il@ lVitnesses:

H. B. DAVIS, T.- T. Grmmlvwoon. l...

